"The thing is, you want tools that work "everywhere", not every target runs the same hw, most, if not all, have slurp boxen, though."
No, you want the most effective tools, and you keep as many tools as you need to be as effective as you can in as many things as you can. That's why a good garage keeps a lot of tools. That's why State-level malware writer ALSO write Linux and MacOS malware.